Re: [kvm-devel] [RFC] virtio-blk PCI backend

[Christian B. <bor...@de...>]

Am Freitag, 9. November 2007 schrieb Dor Laor:
> I believe that the network interface will quickly go to the kernel since 
> copy takes most of the
> cpu time and qemu does not support scatter gather dma at the moment.
> Nevertheless using pio seems good enough, Anthony's suggestion of 
> notifying the kernel using ioctls
> is logical. If we'll run into troubles further on we can add a hypercall 
> capability and if exist use hypercalls
> instead of pios.

Sorry for being late in this thread.
We (s390) will need a hypercall as we do not have port I/O. I think it should be
possible to default to hypercall on s390 and use pio everywhere else.

Christian